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<h1>src/qvio/qvopencvreader.cpp</h1><a href="qvopencvreader_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> *      Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012. PARP Research Group.</span>
<a name="l00003"></a>00003 <span class="comment"> *      &lt;http://perception.inf.um.es&gt;</span>
<a name="l00004"></a>00004 <span class="comment"> *      University of Murcia, Spain.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> *      This file is part of the QVision library.</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> *      QVision is free software: you can redistribute it and/or modify</span>
<a name="l00009"></a>00009 <span class="comment"> *      it under the terms of the GNU Lesser General Public License as</span>
<a name="l00010"></a>00010 <span class="comment"> *      published by the Free Software Foundation, version 3 of the License.</span>
<a name="l00011"></a>00011 <span class="comment"> *</span>
<a name="l00012"></a>00012 <span class="comment"> *      QVision is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> *      but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00015"></a>00015 <span class="comment"> *      GNU Lesser General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> *      You should have received a copy of the GNU Lesser General Public</span>
<a name="l00018"></a>00018 <span class="comment"> *      License along with QVision. If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020 
<a name="l00024"></a>00024 
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;QUrl&gt;</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="preprocessor">#ifdef QVIPP</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#include &lt;qvipp.h&gt;</span>
<a name="l00030"></a>00030 <span class="preprocessor">#endif // QVIPP</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include &lt;QVOpenCVReader&gt;</span>
<a name="l00033"></a>00033 
<a name="l00034"></a>00034 <span class="keywordtype">bool</span> QVOpenCVReader:: open(<span class="keyword">const</span> QString &amp; url_string,
<a name="l00035"></a>00035                          <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> &amp; suggested_cols, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> &amp; suggested_rows,
<a name="l00036"></a>00036                          <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> &amp; suggested_fps, <a class="code" href="classQVVideoReader.html#a5897497caf38c09bace454d3e205ede0" title="Open options for a video source.">QVVideoReader::OpenOptions</a> &amp; suggested_options,
<a name="l00037"></a>00037                          <a class="code" href="classQVVideoReader.html#ae7f437e441e6b0d6c0acbb1edbdc6421" title="Possible preferred modes for video sources.">QVVideoReader::TSourceMode</a> &amp; source_mode)
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039         <span class="comment">// Preferred mode: RGB</span>
<a name="l00040"></a>00040         source_mode = <a class="code" href="classQVVideoReader.html#ae7f437e441e6b0d6c0acbb1edbdc6421a65e1ba18291e438596be5197a7901337" title="Source outputs RGB images by default.">QVVideoReader::RGBMode</a>;
<a name="l00041"></a>00041 
<a name="l00042"></a>00042         isFile = isCamera = <span class="keyword">false</span>;
<a name="l00043"></a>00043         <span class="comment">// File name:</span>
<a name="l00044"></a>00044         QUrl URL(url_string);
<a name="l00045"></a>00045         <span class="keywordflow">if</span>(URL.scheme() == <span class="stringliteral">&quot;cvf&quot;</span>) {
<a name="l00046"></a>00046             isFile = <span class="keyword">true</span>;
<a name="l00047"></a>00047             QString fileName = URL.path();
<a name="l00048"></a>00048             video_capture = <span class="keyword">new</span> cv::VideoCapture(fileName.toStdString());
<a name="l00049"></a>00049         } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(URL.scheme() == <span class="stringliteral">&quot;cvc&quot;</span>) {
<a name="l00050"></a>00050             isCamera = <span class="keyword">true</span>;
<a name="l00051"></a>00051             <span class="comment">// URL.host should be the video device number passed to OpenCV:</span>
<a name="l00052"></a>00052             <span class="keywordtype">bool</span> okDevice;
<a name="l00053"></a>00053             <span class="comment">//std::cout &lt;&lt; &quot;URL.fragment(): &quot; &lt;&lt; qPrintable(URL.fragment()) &lt;&lt; &quot;\n&quot;;</span>
<a name="l00054"></a>00054             <span class="keywordtype">int</span> device = URL.fragment().toInt(&amp;okDevice);
<a name="l00055"></a>00055             <span class="keywordflow">if</span>(okDevice)
<a name="l00056"></a>00056                 video_capture = <span class="keyword">new</span> cv::VideoCapture(device);
<a name="l00057"></a>00057         } <span class="keywordflow">else</span> {
<a name="l00058"></a>00058             std::cout &lt;&lt; <span class="stringliteral">&quot;Warning:: unknown scheme &quot;</span> &lt;&lt; qPrintable (URL.scheme())
<a name="l00059"></a>00059                       &lt;&lt; <span class="stringliteral">&quot;in QVOpenCVReader::open() method\n&quot;</span>;
<a name="l00060"></a>00060             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00061"></a>00061         }
<a name="l00062"></a>00062 
<a name="l00063"></a>00063         <span class="comment">// std::cout &lt;&lt; &quot;Video opened:&quot; &lt;&lt; (video_capture-&gt;isOpened()?1:0) &lt;&lt; &quot;\n&quot;;</span>
<a name="l00064"></a>00064         <span class="comment">// std::cout.flush();</span>
<a name="l00065"></a>00065 
<a name="l00066"></a>00066         <span class="comment">// Try to adjust input size and fps (will not always succeed):</span>
<a name="l00067"></a>00067         <span class="keywordflow">if</span>(suggested_rows != 0)
<a name="l00068"></a>00068             <span class="keywordflow">if</span>(not video_capture-&gt;set(CV_CAP_PROP_FRAME_HEIGHT,suggested_rows))
<a name="l00069"></a>00069                 {;} <span class="comment">// std::cout &lt;&lt; &quot;Error setting CV_CAP_PROP_FRAME_HEIGHT.\n&quot;;</span>
<a name="l00070"></a>00070         <span class="keywordflow">if</span>(suggested_cols != 0)
<a name="l00071"></a>00071             <span class="keywordflow">if</span>(not video_capture-&gt;set(CV_CAP_PROP_FRAME_WIDTH,suggested_cols))
<a name="l00072"></a>00072                 {;} <span class="comment">// std::cout &lt;&lt; &quot;Error setting CV_CAP_PROP_FRAME_WIDTH.\n&quot;;</span>
<a name="l00073"></a>00073         <span class="keywordflow">if</span>(suggested_fps != 0)
<a name="l00074"></a>00074             <span class="keywordflow">if</span>(not video_capture-&gt;set(CV_CAP_PROP_FPS,suggested_fps))
<a name="l00075"></a>00075                 {;} <span class="comment">// std::cout &lt;&lt; &quot;Error setting CV_CAP_PROP_FPS.\n&quot;;</span>
<a name="l00076"></a>00076 
<a name="l00077"></a>00077         <span class="keywordtype">double</span> value;
<a name="l00078"></a>00078         value = video_capture-&gt;get(CV_CAP_PROP_FRAME_WIDTH);
<a name="l00079"></a>00079         suggested_cols = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(value);
<a name="l00080"></a>00080         value = video_capture-&gt;get(CV_CAP_PROP_FRAME_HEIGHT);
<a name="l00081"></a>00081         suggested_rows = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(value);
<a name="l00082"></a>00082         value = video_capture-&gt;get(CV_CAP_PROP_FPS);
<a name="l00083"></a>00083         suggested_fps = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(value);
<a name="l00084"></a>00084         value = video_capture-&gt;get(CV_CAP_PROP_FRAME_COUNT);
<a name="l00085"></a>00085         total_frames =  <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(value);
<a name="l00086"></a>00086 
<a name="l00087"></a>00087         <span class="comment">// RealTime &amp; NoLoop flags:</span>
<a name="l00088"></a>00088         <span class="comment">// realTime = (suggested_options &amp; QVVideoReader::RealTime);</span>
<a name="l00089"></a>00089         noLoop = (suggested_options &amp; <a class="code" href="classQVVideoReader.html#a0a3fbed9c7741e2c85c65df76c8e604bafa19a0a74c786eaa4d71f5102a1a7aa3" title="Continue from the beginning of the video source when it reaches the end.">QVVideoReader::NoLoop</a>);
<a name="l00090"></a>00090 
<a name="l00091"></a>00091         <span class="comment">// OpenCV will capture RGB frames:</span>
<a name="l00092"></a>00092         video_capture-&gt;set(CV_CAP_PROP_CONVERT_RGB,1);
<a name="l00093"></a>00093 
<a name="l00094"></a>00094         <span class="keywordflow">if</span>(video_capture-&gt;isOpened())  <span class="comment">// Check if we succeeded</span>
<a name="l00095"></a>00095             <span class="keywordflow">return</span> TRUE;
<a name="l00096"></a>00096         <span class="keywordflow">else</span>
<a name="l00097"></a>00097             <span class="keywordflow">return</span> FALSE;
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 
<a name="l00100"></a>00100 <span class="keywordtype">bool</span> QVOpenCVReader::close()
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102     <span class="keywordflow">if</span>(video_capture != 0)
<a name="l00103"></a>00103         <span class="keyword">delete</span> video_capture;
<a name="l00104"></a>00104     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 
<a name="l00107"></a>00107 
<a name="l00108"></a>00108 <span class="keywordtype">bool</span> QVOpenCVReader::grab(<a class="code" href="classQVImage.html">QVImage&lt;uChar,1&gt;</a> &amp;imgR, <a class="code" href="classQVImage.html">QVImage&lt;uChar,1&gt;</a> &amp;imgG, <a class="code" href="classQVImage.html">QVImage&lt;uChar,1&gt;</a> &amp;imgB)
<a name="l00109"></a>00109 {
<a name="l00110"></a>00110         cv::Mat frame;
<a name="l00111"></a>00111 
<a name="l00112"></a>00112         <span class="keywordtype">bool</span> grabbedframe = video_capture-&gt;grab();
<a name="l00113"></a>00113         <span class="keywordflow">if</span>(not noLoop &amp; not grabbedframe) {
<a name="l00114"></a>00114             <a class="code" href="classQVBaseReader.html#a7f47dba42a7dbdd9c04b364b8bf890b0" title="Pure virtual method to set the current position in the video.">seek</a>(0);
<a name="l00115"></a>00115             grabbedframe = video_capture-&gt;grab();
<a name="l00116"></a>00116         }
<a name="l00117"></a>00117 
<a name="l00118"></a>00118         <span class="keywordflow">if</span>(grabbedframe)
<a name="l00119"></a>00119             video_capture-&gt;retrieve(frame);
<a name="l00120"></a>00120         <span class="keywordflow">else</span>
<a name="l00121"></a>00121             <span class="keywordflow">return</span> FALSE;
<a name="l00122"></a>00122 
<a name="l00123"></a>00123         IplImage ipl_image = frame;
<a name="l00124"></a>00124         <a class="code" href="classQVImage.html">QVImage&lt;uChar,3&gt;</a> ColorImage = <a class="code" href="classQVImage.html">QVImage&lt;uChar,3&gt;</a>(&amp;ipl_image);
<a name="l00125"></a>00125         imgR = imgG = imgB = <a class="code" href="classQVImage.html" title="Image representation class for the QVision.">QVImage&lt;uchar&gt;</a>(ColorImage.<a class="code" href="classQVImage.html#ad0f2758702ee4d96d538aa353ae81bb7" title="Overloaded function from QVGenericImage::getCols().">getCols</a>(),ColorImage.<a class="code" href="classQVImage.html#a55e71ad628f450ee82bb4226cb62ec17" title="Overloaded function from QVGenericImage::getRows().">getRows</a>());
<a name="l00126"></a>00126         <span class="comment">// (OpenCV reads BGR instead of RGB):</span>
<a name="l00127"></a>00127         Copy(ColorImage,0,imgB);
<a name="l00128"></a>00128         Copy(ColorImage,1,imgG);
<a name="l00129"></a>00129         Copy(ColorImage,2,imgR);
<a name="l00130"></a>00130 
<a name="l00131"></a>00131         <span class="keywordflow">return</span> TRUE;
<a name="l00132"></a>00132 
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 
<a name="l00135"></a>00135 <span class="keywordtype">int</span> QVOpenCVReader::getLength()
<a name="l00136"></a>00136 {
<a name="l00137"></a>00137     <span class="keywordflow">return</span> total_frames;
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 
<a name="l00140"></a>00140 <span class="keywordtype">int</span> QVOpenCVReader::getPos()
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142     <span class="keywordtype">double</span> value;
<a name="l00143"></a>00143     <span class="keywordflow">if</span>(isFile)
<a name="l00144"></a>00144         value = video_capture-&gt;get(CV_CAP_PROP_POS_FRAMES);
<a name="l00145"></a>00145     <span class="keywordflow">else</span> <span class="comment">// (isCamera)</span>
<a name="l00146"></a>00146         value = -1;
<a name="l00147"></a>00147     <span class="comment">//std::cout &lt;&lt; &quot;value=&quot; &lt;&lt; value &lt;&lt; &quot;;\n&quot;;</span>
<a name="l00148"></a>00148     <span class="comment">//std::cout &lt;&lt; &quot;static_cast&lt;int&gt;(value)=&quot; &lt;&lt; static_cast&lt;int&gt;(value) &lt;&lt; &quot;;\n&quot;;</span>
<a name="l00149"></a>00149     <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(value);
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 
<a name="l00152"></a>00152 <span class="keywordtype">bool</span> QVOpenCVReader::seek(<span class="keywordtype">int</span> pos)
<a name="l00153"></a>00153 {
<a name="l00154"></a>00154     <span class="keywordtype">double</span> value = <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(pos);
<a name="l00155"></a>00155     <span class="comment">// std::cout &lt;&lt; &quot;pos=&quot; &lt;&lt; pos &lt;&lt; &quot;;\n&quot;;</span>
<a name="l00156"></a>00156     <span class="comment">// std::cout &lt;&lt; &quot;video_capture-&gt;set(CV_CAP_PROP_POS_FRAMES,&quot; &lt;&lt; value &lt;&lt; &quot;);\n&quot;;</span>
<a name="l00157"></a>00157     <span class="keywordflow">return</span> video_capture-&gt;set(CV_CAP_PROP_POS_FRAMES,value);
<a name="l00158"></a>00158 }
</pre></div></div>
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<center><a href="http://perception.inf.um.es/QVision">QVision framework</a>.
<a href="http://perception.inf.um.es">PARP research group</a>.
Copyright &copy; 2007, 2008, 2009, 2010, 2011.</center>
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